diff options
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 88 |
1 files changed, 81 insertions, 7 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 2ad64efdf183..84370363da80 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -476,14 +476,15 @@ running once the system is up. arch/i386/kernel/cpu/cpufreq/elanfreq.c. elevator= [IOSCHED] - Format: {"as" | "cfq" | "deadline" | "noop"} + Format: {"anticipatory" | "cfq" | "deadline" | "noop"} See Documentation/block/as-iosched.txt and Documentation/block/deadline-iosched.txt for details. - elfcorehdr= [IA-32] + elfcorehdr= [IA-32, X86_64] Specifies physical address of start of kernel core - image elf header. - See Documentation/kdump.txt for details. + image elf header. Generally kexec loader will + pass this option to capture kernel. + See Documentation/kdump/kdump.txt for details. enforcing [SELINUX] Set initial enforcing status. Format: {"0" | "1"} @@ -638,6 +639,14 @@ running once the system is up. inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver Format: <irq> + combined_mode= [HW] control which driver uses IDE ports in combined + mode: legacy IDE driver, libata, or both + (in the libata case, libata.atapi_enabled=1 may be + useful as well). Note that using the ide or libata + options may affect your device naming (e.g. by + changing hdc to sdb). + Format: combined (default), ide, or libata + inttest= [IA64] io7= [HW] IO7 for Marvel based alpha systems @@ -708,9 +717,17 @@ running once the system is up. load_ramdisk= [RAM] List of ramdisks to load from floppy See Documentation/ramdisk.txt. - lockd.udpport= [NFS] + lockd.nlm_grace_period=P [NFS] Assign grace period. + Format: <integer> + + lockd.nlm_tcpport=N [NFS] Assign TCP port. + Format: <integer> + + lockd.nlm_timeout=T [NFS] Assign timeout value. + Format: <integer> - lockd.tcpport= [NFS] + lockd.nlm_udpport=M [NFS] Assign UDP port. + Format: <integer> logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver Format: <irq> @@ -829,7 +846,7 @@ running once the system is up. mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel memory. - memmap=exactmap [KNL,IA-32] Enable setting of an exact + memmap=exactmap [KNL,IA-32,X86_64] Enable setting of an exact E820 memory map, as specified by the user. Such memmap=exactmap lines can be constructed based on BIOS output or other requirements. See the memmap=nn@ss @@ -852,6 +869,49 @@ running once the system is up. mga= [HW,DRM] + migration_cost= + [KNL,SMP] debug: override scheduler migration costs + Format: <level-1-usecs>,<level-2-usecs>,... + This debugging option can be used to override the + default scheduler migration cost matrix. The numbers + are indexed by 'CPU domain distance'. + E.g. migration_cost=1000,2000,3000 on an SMT NUMA + box will set up an intra-core migration cost of + 1 msec, an inter-core migration cost of 2 msecs, + and an inter-node migration cost of 3 msecs. + + WARNING: using the wrong values here can break + scheduler performance, so it's only for scheduler + development purposes, not production environments. + + migration_debug= + [KNL,SMP] migration cost auto-detect verbosity + Format=<0|1|2> + If a system's migration matrix reported at bootup + seems erroneous then this option can be used to + increase verbosity of the detection process. + We default to 0 (no extra messages), 1 will print + some more information, and 2 will be really + verbose (probably only useful if you also have a + serial console attached to the system). + + migration_factor= + [KNL,SMP] multiply/divide migration costs by a factor + Format=<percent> + This debug option can be used to proportionally + increase or decrease the auto-detected migration + costs for all entries of the migration matrix. + E.g. migration_factor=150 will increase migration + costs by 50%. (and thus the scheduler will be less + eager migrating cache-hot tasks) + migration_factor=80 will decrease migration costs + by 20%. (thus the scheduler will be more eager to + migrate tasks) + + WARNING: using the wrong values here can break + scheduler performance, so it's only for scheduler + development purposes, not production environments. + mousedev.tap_time= [MOUSE] Maximum time between finger touching and leaving touchpad surface for touch to be considered @@ -907,6 +967,14 @@ running once the system is up. nfsroot= [NFS] nfs root filesystem for disk-less boxes. See Documentation/nfsroot.txt. + nfs.callback_tcpport= + [NFS] set the TCP port on which the NFSv4 callback + channel should listen. + + nfs.idmap_cache_timeout= + [NFS] set the maximum lifetime for idmapper cache + entries. + nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels no387 [BUGS=IA-32] Tells the kernel to use the 387 maths @@ -987,6 +1055,8 @@ running once the system is up. nowb [ARM] + nr_uarts= [SERIAL] maximum number of UARTs to be registered. + opl3= [HW,OSS] Format: <io> @@ -1165,6 +1235,10 @@ running once the system is up. Limit processor to maximum C-state max_cstate=9 overrides any DMI blacklist limit. + processor.nocst [HW,ACPI] + Ignore the _CST method to determine C-states, + instead using the legacy FADT method + prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk before loading. See Documentation/ramdisk.txt. |